JS 高效去重

function unique(arr) {

var result = [], isRepeated;

for (var i = 0, len = arr.length; i < len; i++) {

isRepeated = false;

for (var j = 0, len = result.length; j < len; j++) {

if (arr[i] == result[j]) {

isRepeated = true;

break;

}

}

if (!isRepeated) {

result.push(arr[i]);

}

}

return result;

}